<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>context_processor钩子函数详解</title>
</head>
<body>
    <h3>context_processor钩子函数详解</h3>
    {% if username %}
        <p>{{ username }}</p>
    {% endif %} 
</body>
</html>